Method for detecting knock in an internal combustion engine

US6912460B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Juergen Sauler · Stuttgart, DE
• Oskar Torno · Schwieberdingen, DE
• Axel Heinstein · Welzheim, DE
• Carsten Kluth · Stuttgart, DE
• Werner Haeming · Neudenau, DE

Key dates

• Filing date: Aug 20, 2001
• Grant date: Jun 28, 2005
• Expiry date: Jan 6, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L23/225
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The method for knock detection includes establishing that knock is occurring in the internal combustion engine when the amplified knock signal exceeds a predetermined reference level in a predetermined manner. The reference level is determined on the basis of individual cylinders and the increase in the reference level is limited when a new reference level leaves a predetermined reference level range or the gradient of the sound increase exceeds a predetermined threshold value. For determination of the reference level range and/or the threshold for the gradient average values of the signals originating from the sound of other cylinders are considered.